Triad

Look up triad or triads in Wiktionary, the free dictionary.

A triad is a "group of three".

Biology, anatomy, and medicine

Catalytic triad, biochemical term for three amino acid residues found within some proteases
Currarino triad, three malformations with a genetic link
Triadica, plant genus of the family Euphorbiaceae
Portal triad, distinctive arrangement in the liver
Triad (anatomy), structure in skeletal muscles, formed by a T tubule surrounded by sarcoplasmic reticulum
Unhappy triad, tearing of one or both of the cruciate ligaments, along with collateral ligament damage and meniscal tear(s)
Medical triad, a group of three signs or symptoms for diagnosis of various conditions:
- Beck's triad (cardiology), for cardiac tamponade
- Charcot's neurologic triad, for multiple sclerosis
- Charcot's cholangitis triad, for ascending cholangitis
- Cushing's triad, for head injuries
- Dieulafoy's triad, for acute appendicitis
- Female athlete triad, low energy availability in female athletes
- Hutchinson's triad, congenital syphilis
- Meckler's triad, for Boerhaave syndrome
- Trauma triad of death, the combination of hypothermia, acidosis and coagulopathy often seen in severe trauma cases
- Virchow's triad, for venous thrombosis
- Whipple's triad, for hypoglycemia
- Samter's Triad, also known as Aspirin-induced asthma, also known as:
  - Acetylsalicylic acid Triad
  - Francis' Triad
  - Triad Asthma
  - Widal's Triad

Beck's cognitive triad, types of negative thought present in depression
Dark triad, group of three undesirable personality traits
MacDonald triad, group of sociopathic infantile traits for anti-social personality disorder
Triad (relationship), relationship between three people, related to polyamory
Triad (sociology), group of three people as a unit of study

Nuclear triad, the strategy of splitting a nation's nuclear deterrent into land, sea, and air systems
The economic "triad" of Japan and Southeast Asia, North America, and Western Europe in the theory of triadization

CIA triad (confidentiality, integrity and availability), core principles of information security

Triad (underground society), Chinese organized-crime societies
Lexington Triad, a group of three fraternities founded at colleges in Lexington, Virginia
Miami Triad, a group of three fraternities founded at Miami University in Oxford, Ohio
Syracuse Triad, three women's sororities founded at Syracuse University
Triad Broadcasting, US radio station operator
Triad High School (disambiguation)
Triad Hospitals, former hospital operator based in Plano, Texas
Triad Racing Technologies, former NASCAR team
Triad Securities, a broker-dealer
Triad Strategies, American lobbying firm
Triad Theater, in New York City
Union Triad, a group of three fraternities founded at Union College in Schenectady, New York

Triad (music), three-note chord consisting of a "root" note together with the third and fifth above it
Triad (band), a Swedish musical band from the late 1980s
"Triad" (Pitchshifter song), song by Industrial metal band Pitchshifter from their 1993 album Desensitized
"Triad" (The Byrds song), 1967 song about a ménage à trois
"Triad", song by progressive rock band Tool from their 2001 album Lateralus

The Triad (Charmed), group of three powerful demons who are the opposites of the Charmed One's in the sense of good and evil in the television series Charmed
Triiad, alien species from the television series Hypernauts

Welsh Triads, collections of medieval Welsh legend and history
Triads of Ireland, triplet proverbs and aphorisms
The three parts of the Pindaric ode: the strophe, the antistrophe, and the epode